They don't know what they are doing!

I use to rent from Bregan properties then the flat I was staying in got sold while I was staying there, they didn't bother to tell me I had to hear it from the new agents calling me and telling me that Bregan properties won't transfer my deposit to them. I emailed them and would always get a rude response or no response from Chris. When I moved out in December the new agents told me that they didn't transfer transfer the key deposit to them so I had to contact them myself to find out what happened. They sent me statements with incorrect amounts and when I asked for a POP of the amount transferred to the new agents, they sent me one with an amount that can't be and is a transfer they made to their client and not the new landlord. Now they refuse ignore my emails and are rude on the calls when I ask for more information